Optician Practical Exam 2025 – Complete Practice Test Guide

The physical property of plus lenses that involves their shape is characterized by thicker centers. Plus lenses are convex, meaning they are thicker in the middle and taper off toward the edges. This shape is essential for their function, as it allows the lens to converge light rays, which helps in correcting hyperopia (farsightedness) by allowing the light to focus on the retina.

The design of plus lenses with thicker centers enables them to bend light rays towards each other, which effectively increases the focal point and aids in clear vision for objects that are far away. The curvature of the lens is fundamental to how it refracts light, and this curvature is responsible for the thickness at the center relative to the edges. Understanding this property is crucial for anyone pursuing a career in optometry or optical dispensing, as it directly relates to the effectiveness of lens prescriptions and the visual aids provided to patients.